Top Definition
(Pronounced Fumb-Buffle)

Acronym for the phrase: Fuck my brother's best friends' life. also, used in place of FML because it sounds funnier.
Kari: "My little brother is yelling at kids on xbox live through his mic."

Gabe: "ORLY?"

Kari: "Yes, and his best friend just got called a queermunch kamakazi douchemuffin by a ten year old. FMBBFL."

Gabe: "Yes, FYBBFL"

*ticklish laughter*
by Toodles Punch April 19, 2010

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